No input signal from your computer or external device is being received. Could be loose connection or connected device not powered up or asleep. If laptop connected you need to toggle external screen <Fn><F8> toggles through displays.

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Related Questions:

hi;
your monitor has no problem, its your cpu. Try to hook your monitor to your laptop,and change the display setting to your LCD monitor.
If LCD has displaying no signal mean signal coming form the Video card of your CPU
try to visualize if you hearing some beeps into from CPU, some motherboard has beep codes
if there's an error or failure to your CPU, 1 beep means its good system test.
if you don't hear any beeps, try to check first your Video Card
if you have Spare try to replace it, try to reset all the connectors even Memory card to its slot.
reset means pull the connectors and place it back again,
also check the power supply of cpu if still functioning good.but you can test it by multi volt meter.
if nothing happens check your motherboard most common failure is bloating capacitor, and overheating chipset.
thanks....................hope this helps...................

For my Viewsonic TV, first make sure that your input is TV. (Press the Input button on the remote (upper left) or the TV (furthest right). Use the arrow keys or multiple presses of Input to change the current input.) Next press Menu. Use the up/down arrows to navigate to the TV menu (the icon looks like a TV). Press Enter. Set the type of incoming TV signal (Cable or Air or let the tv figure it out with Auto). Then go down to the line labeled AutoScan and press Enter. You may be prompted to begin the scan or to select the type of channels to scan. Press Enter again after making the selection.

It means your monitor has both analog and digital inputs and it is trying to use the analog one and not finding any signal. What kind of a connecting cable are you using, blue ends with 15 pins, or white ends with lots of pins and one long wide one on one end?

That means the RGB signal that is being presented to the Projector is of a resolution either too high or too low for the projector to handle.Try reducing the resolution of your picture from your computer.

It can mean it is not getting the video signal from the video card, bad VGA cable, or it is in safety shutdown mode. Try it with another PC first. If it still does not work then you will need to troubelshoot it. Read my guides and see the picturesd of failed VIEWSONIC and all other brands mostly due to bad caps.

Flashing power light often means the monitor isn't getting a signal. When you turn the monitor off and back on, do you see the viewsonic logo for a few seconds? Try plugging it into a different computer to see if it comes on.

If plugging it into another computer doesn't work, it may be a bad power circuit in the monitor. A common problem with monitors is the capacitors going bad. If you're handy with a soldering iron, you can try replacing them yourself. Look here for pictures and instructions: Fix an LCD Monitor

To clarify, you know that analog is referring to the VGA 15 pin video input, and digital is referring to the DVI video input, right? You can't have the digital video unless you use the DVI input, which requires a DVI output from your computer (and a DVI cord of course).
If you already knew this and you mean that it won't switch over to your DVI, then there could be several problems. Most of them being with your DVI signal source (computer). Try booting the PC with ONLY the DVI cord attached between the PC and the monitor. If you have a VGA cord plugged into either, UNPLUG IT FROM BOTH ENDS.

Check the power settings o nthe laptop, go to control panel, power options. see if its set to turn off the screen if theres no activity. I doubt this is your problem but worth a try. Going back to the viewsonic picture means its not getting a signal. So either the cable may be faulty which is less likely, or it is a software problem. Does the screen flicker on the laptop when doing the same thing (if the projector is not connected)?